{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA6120-1DB33","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA6120-1DB33","canonicalUrl":"https://aoctrl.com/siemens/3RA6120-1DB33","factsUrl":"https://aoctrl.com/api/mcp/products/3RA6120-1DB33","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA6120-1DB33 compact direct starter, 5.5 kW at 400 V, 53 kA breaking capacity, 24 V AC/DC control, CLASS 10/20 adjustable, screw and snap-on DIN rail mounting.","salesMarkdown":"## Sizing the 3RA6120-1DB33 for the motor load That 53 kA figure tells you the starter can survive a bolted fault at the motor terminals up to that level without the upstream breaker needing to clear first — useful when the panel SCCR requirement is high and you want to avoid a larger frame. ## Mounting and wiring constraints The starter mounts on standard 35 mm DIN rail, either vertical or horizontal, and uses both screw and snap-on fastening. The 45 mm width keeps the footprint tight — three of these fit in a standard 140 mm wide enclosure section. The main circuit connection is plug-in without terminals — the power contacts are on the backplane, so you wire the base unit once and the starter module plugs in. This matters for MRO: swap a failed starter in under a minute without disturbing the panel wiring. ## Environmental and mechanical endurance Rated for continuous operation per IEC 60947-6-2, the 3RA6120-1DB33 handles sustained motor duty without derating in ambient temperatures from -20 to +60 °C. Shock resistance is 6g for 10 ms in all axes, and vibration resistance covers 4 to 500 Hz at 20 m/s² — both figures confirm it holds up on a machine frame or conveyor line, not just in a climate-controlled cabinet. Power dissipation is 2.8 W AC maximum and 2.9 W DC maximum — negligible heat for a panel with forced ventilation, but worth noting if the enclosure is sealed and densely packed. The two onboard LEDs give local status indication for the control voltage and the output state, which speeds up fault-finding on the line.","metaTitle":"Siemens 3RA6120-1DB33 SIRIUS Compact Starter","metaDescription":"Siemens 3RA6120-1DB33 SIRIUS compact direct starter, 5.5 kW at 400 V, 53 kA breaking capacity, adjustable CLASS 10/20, 24 V AC/DC control.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"165 mm","Solid":"0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)","Width":"45 mm","at DC":"24 ... 24 V","title":"3RA6120-1DB33","Height":"170 mm","at 400 V":"53 kA","at 50 Hz":"24 ... 24 V","at 60 Hz":"24 V","Trip Class":"CLASS 10 and 20 adjustable","Recommended":"vertical, on horizontal standard DIN rail","description":"SIRIUS Compact load feeder DOL starter 690 V 24 V AC/DC 50...60 Hz 3...12 A IP20 Connection main circuit: plug-in, without terminals Connection auxiliary circuit: screw terminal","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","at AC maximum":"2.8 W","at DC maximum":"2.9 W","During Storage":"-55 ... +80 °C","number of LEDs":"2","Type Of Voltage":"AC/DC","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-55 ... +80 °C","Fastening Method":"screw and snap-on mounting","IO-Link protocol":"No","Shock Resistance":"a=60 m/s2 (6g) with 10 ms per 3 shocks in all axes","Mounting Position":"any","at DC rated value":"24 V","Product Brand Name":"SIRIUS","Type Of Assignment":"continous operation according to IEC 60947-6-2","Degree Of Pollution":"3","Product Designation":"compact starter","Vibration Resistance":"f= 4 ... 5.8 Hz, d= 15 mm; f= 5.8 ... 500 Hz, a= 20 m/s²; 10 cycles","at 400 V rated value":"5 500 W","at 480 V rated value":"12 A","at 50 Hz rated value":"24 V","at 500 V rated value":"3 kA","at 60 Hz rated value":"24 V","at 600 V rated value":"12 A","at 690 V rated value":"3 kA","AS-Interface protocol":"No","Design Of The Product":"direct starter","For Main Current Circuit":"plug-in without terminals","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"3 hp","at 460/480 V rated value":"7.5 hp","at 575/600 V rated value":"10 hp","at AC at 400 V rated value":"12 A","NO-Load Switching Frequency":"3 600 1/h","Of The Main Contacts Typical":"10 000 000","at AC in hot operating state":"1.8 W","at AC-3 at 400 V rated value":"5.5 kW","Of Auxiliary Contacts Typical":"10 000 000","Substance Prohibitance (Date)":"05/01/2012","Insulation Voltage Rated Value":"690 V","at DC-13 at 6 A at 24 V typical":"30 000","at AC-15 at 6 A at 230 V typical":"200 000","degree of protection NEMA rating":"other","For Auxiliary And Control Circuit":"screw-type terminals","Of The Signaling Contacts Typical":"10 000 000","Between Main And Auxiliary Circuit":"400 V","Design Of Short-Circuit Protection":"electromagnetic","Product Extension Auxiliary Switch":"Yes","Product Function Bus Communication":"No","Relative Humidity During Operation":"10 ... 90 %","Without Load Current Share Typical":"2.9 W","Surge Voltage Resistance Rated Value":"6 000 V","at AWG cables for auxiliary contacts":"2x (20 ... 14)","Between Control And Auxiliary Circuit":"300 V","at AC in hot operating state per pole":"0.6 W","Between Auxiliary And Auxiliary Circuit":"250 V","due to burst according to IEC 61000-4-4":"4 kV main contacts, 2 kV auxiliary contacts","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"0.5 ... 2.5 mm², 2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Formula For Making Capacity Limit Current":"12 x Ie","Product Function Short Circuit Protection":"Yes","Supply voltage required Auxiliary voltage":"No","with low demand rate according to SN 31920":"40 %","Formula For Limit Current Breaking Capacity":"10 x Ie","at AC-41 according to IEC 60947-6-2 maximum":"750 1/h","at AC-43 according to IEC 60947-6-2 maximum":"250 1/h","with high demand rate according to SN 31920":"50 %","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","operating voltage at AC-3 rated value maximum":"690 V","electrostatic discharge according to IEC 61000-4-2":"8 kV","contact rating of auxiliary contacts according to UL":"contacts 21-22, 13-14, 43-44 Q600 / A600, contacts 77-78 R300 / B300, contacts 95-96-98 R300 / D300","Product Component Removable Terminal For Main Circuit":"Yes","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","product function control circuit interface with IO link":"No","conducted HF interference emissions according to CISPR11":"150 kHz ... 30 MHz Class A","field-bound HF interference emission according to CISPR11":"30 ... 1000 MHz Class A","operational current of auxiliary contacts at AC-12 maximum":"10 A","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","Product Function Control Circuit Interface To Parallel Wiring":"Yes","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"3 ... 12 A","number of NO contacts of instantaneous short-circuit trip unit for signaling contact":"1","For Short-Circuit Protection Of The Signaling Switch Of The Overload Release Required":"4A gL/gG/400V","number of CO contacts of the current-dependent overload release for signaling contact":"1","For Short-Circuit Protection Of The Signaling Switch Of The Short-Circuit Release Required":"6A gL/gG/400V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$270.51","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4f5b40802c08463c7287640218217a75.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=437228&mlfb=3RA6120-1DB33"},"ai":{"faq":[{"question":"What is the short-circuit breaking capacity of 3RA6120-1DB33 at 400 V?","answer":"The rated short-circuit breaking capacity is 53 kA at 400 V."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA6120-1DB33","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RA6120-1DB33 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}